Yamaha HR-31D4
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Reference Notes
Yamaha HR-31D4 appears in the French Horn catalog section with 17.28 mm rim, Medium Deep cup, 4.5 mm throat, Standard backbore, and Horn shank. Database tags list it for Orchestral, Classical, and All Around use. Use these measurements as a comparison starting point: fit and response still depend on the player, dental structure, instrument receiver, and each manufacturer's measuring method.
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